repair: Fall back to dry-run
repair: Fall back to dry-run

When operating on a system installation as non-root,
making changes will fail, and the experience is a
bit confusing. Be explicit about it.

Closes: #2473
Approved by: alexlarsson

flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak